scholarly journals Early Results of a Modular Cementless Tibial Component for Total Knee Arthroplasty

2014 ◽  
Vol 4 (3) ◽  
pp. 27-30
Author(s):  
Raj Sinha, MD, PhD ◽  
Cristian Balcescu
Keyword(s):  
Tibial Component ◽  
Base Plate ◽  
Clinical Results ◽  
Success Rates ◽  
Short Term ◽  
Early Results ◽  
Primary Tkas ◽  
Total Knee ◽  
Cementless Components ◽  
Bony Fixation

Cementless components in TKA have been used for almost 3 decades, despite mixed success rates. However, biologic fixation remains attractive, especially for younger patients, because of the potential of unlimited durability. This paper is the first to report results on a modular tibial base plate using trabecular metal as a fixation surface. Twenty-four primary TKAs were evaluated clinical and radiographically at mean 1.9 year followup. Excellent clinical results were obtained. There was no significant subsidence or change in orientation of any component. One component was probably loose radiographically but was insufficiently symptomatic to warrant revision. Five components showed nonprogressive radiolucent lines. One reoperation was performed for stiffness, at which time the components were well fixed. Thus, it would appear that excellent bony fixation can be achieved with a modular cementless tibial component with excellent short-term clinical results.

Predictive value of short-term migration in determining long-term stable fixation in cemented and cementless total knee arthroplasties

2019 ◽  
Vol 101-B (7_Supple_C) ◽  
pp. 55-60 ◽  
Author(s):  
E. K. Laende ◽  
C. G. Richardson ◽  
M. J. Dunbar
Keyword(s):  
Predictive Value ◽  
Predictive Ability ◽  
Porous Metal ◽  
Short Term ◽  
Long Term Follow Up ◽  
Total Knee ◽  
Total Point ◽  
Cementless Components

Aims Early implant migration measured with radiostereometric analysis (RSA) has been proposed as a useful predictor of long-term fixation of tibial components in total knee arthroplasty. Evaluation of actual long-term fixation is of interest for cemented components, as well as for cementless fixation, which may offer long-term advantages once osseointegration has occurred. The objective of this study was to compare the long-term migration with one- and two-year migration to evaluate the predictive ability of short-term migration data and to compare migration and inducible displacement between cemented and cementless (porous metal monoblock) components at least ten years postoperatively. Patients and Methods Patients who had participated in RSA migration studies with two-year follow-up were recruited to return for a long-term follow-up, at least ten years from surgery. Two cemented tibial designs from two manufacturers and one porous metal monoblock cementless tibial design were studied. At the long-term follow-up, patients had supine RSA examinations to determine migration and loaded examinations (single leg stance) to determine inducible displacement. In total, 79 patients (54 female) returned, with mean time since surgery of 12 years (10 to 14). There were 58 cemented and 21 cementless tibial components. Results Migration at one year and two years was significantly correlated with long-term migration (p < 0.001). Median migration at the long-term follow-up was 0.6 mm (maximum total point motion; interquartile range (IQR) 0.4 to 0.9) for the cemented group and 0.6 mm (IQR 0.3 to 1.1) for the cementless group with no difference between groups (p = 0.99). Inducible displacement was significantly lower for the cementless components (p < 0.001). Conclusion Long-term migration was strongly correlated with two-year migration. Although long-term migration was not different for cemented or cementless tibial components, inducible displacement at the long-term visit was significantly lower for these cementless components, suggesting superior fixation. These findings support the predictive value of short-term migration in determining long-term fixation. Cite this article: Bone Joint J 2019;101-B(7 Supple C):55–60

scholarly journals Incidence and Causes of Tibial Component Loosening Based on Level of Obesity in a Large Consecutive Cohort of Cemented Primary TKAs without Stem Extensions

2020 ◽  
Vol 3 ◽  
Author(s):  
Lilly Longawa ◽  
Leonard Buller ◽  
Mary Ziemba-Davis ◽  
R. Michael Meneghini
Keyword(s):  
Aseptic Loosening ◽  
Medical Records ◽  
Tibial Component ◽  
Low Viscosity ◽  
Primary Tkas ◽  
Total Knee ◽  
Potential Impact ◽  
Component Loosening ◽  
Component Revision

Background and Hypothesis: Aseptic loosening is one of the most common failure mechanisms of total knee arthroplasty (TKA) requiring revision.  The influence of obesity on tibial component aseptic loosening remains unknown. Some surgeons advocate the addition of a tibial stem extension to reduce the risk of loosening. The purpose of this study was to quantify the incidence and causes of revision for tibial component loosening in a large consecutive cohort of cemented primary TKAs without stem extensions based upon level of obesity.     Experimental Design or Project Methods: 534 consecutive cemented primary TKAs performed between 2016 and 2018 by one surgeon were retrospectively reviewed. Procedures were performed using consistent surgical, perioperative medical, and pain-control protocols. All tibial implants were tapered thin keeled designs without stem extensions and implanted with low viscosity cement. Medical records were examined and all-cause revisions of the index surgery were documented.     Results: After exclusions for confounds, 525 TKAs were analyzed. Mean age and BMI were 67.8 years and 33.9kg/m2 respectively and 72% were female. Mean follow-up was 19.1 (SD 10.5) months and 48% had minimum two-year follow-up. 41.3% of patients had a BMI greater than 35kg/m2 and 21.9% above 40kg/m2. There were 11 revisions in 10 patients, 1.9% out of all TKAs performed.  Five TKAs required both-component revision and three involved the femoral component only. No tibial component revisions were performed for aseptic loosening.    Conclusion and Potential Impact: None of the standard tibial implants with a keeled design without stem extensions failed in a patient population with greater than 40% obesity.  Despite some suggesting tibial stem extensions should be used in obese TKA patients, these findings suggest that tibial component failure in obese patients may be design specific and routinely utilizing stem extensions may not be warranted and could result in deleterious bone loss at revision if required for reasons other than aseptic loosening. 

Extramedullary Guide Alignment Is not Affected by Obesity in Primary Total Knee Arthroplasty

2020 ◽  
Author(s):  
Jocelyn Compton ◽  
Jessell Owens ◽  
Jesse Otero ◽  
Nicolas Noiseux ◽  
Timothy Brown
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Tibial Component ◽  
Primary Total Knee Arthroplasty ◽  
Coronal Plane ◽  
Coronal Alignment ◽  
Primary Tkas ◽  
Significant Difference ◽  
Total Knee ◽  
Valgus Alignment

AbstractCoronal alignment of the tibial implant correlates with survivorship of total knee arthroplasty (TKA), especially in obese patients. The purpose of this study was to determine if obesity affects coronal plane alignment of the tibial component when utilizing standard extramedullary tibial guide instrumentation during primary TKA. A retrospective review from June 2017 to February 2018 identified 142 patients (162 primary TKAs). There were 88 patients (100 knees) with body mass index (BMI) < 35 kg/m2 and 54 patients (62 knees) with BMI ≥ 35.0 kg/m2. The cohorts did not differ in age (p = 0.37), gender (p = 0.61), or Charlson's comorbidity index (p = 0.54). Four independent reviewers measured the angle between the base of the tibial component and the mechanical axis of the tibia on the anteroposterior view of long-leg film at first postoperative clinic visit. Outliers were defined as patients with greater than 5 degrees of varus or valgus alignment (n = 0). Reoperations and complications were recorded to 90 days postoperatively. There was no significant difference in mean tibial coronal alignment between the two groups (control alignment 90.8 ± 1.2 degree versus obese alignment 90.8 ± 1.2 degree, p = 0.91). There was no difference in varus versus valgus alignment (p = 0.19). There was no difference in the number of outliers (two in each group, p = 0.73). There was no difference in rate of reoperation (p = 1.0) or complication (p = 0.51). Obesity did not affect coronal plane alignment of the tibial component when using an extramedullary guide during primary TKA in our population.

scholarly journals Better Short-term Function After Unicompartmental Compared to Total Knee Arthroplasty

2020 ◽  
Author(s):  
Eric Tille ◽  
Franziska Beyer ◽  
Kai Auerbach ◽  
Marco Tinius ◽  
Jörg Lützner
Keyword(s):  
Total Knee Arthroplasty ◽  
Treatment Option ◽  
Knee Arthroplasty ◽  
Clinical Results ◽  
Matched Pair ◽  
Short Term ◽  
Patient’S Satisfaction ◽  
Patient Reported ◽  
Total Knee ◽  
Matching Criteria

Abstract BackgroundUnicompartmental knee arthroplasty (UKA) is an established treatment option for patients with unicompartmental osteoarthritis (OA). However, strict patient selection is crucial for its success. The proposed advantages include nearly natural knee kinematics, faster rehabilitation and better functional outcomes. Despite these facts and it’s proven cost-effectiveness, there are hesitations for the use of UKA as an alternative to total knee arthroplasty (TKA). Key objectives of this study were therefore to assess clinical and patient-reported-outcome (PRO) as well as patient’s satisfaction after medial UKA in comparison to TKA. MethodsTo assess the outcome after UKA we conducted a prospective multi-center study. 116 patients with unicompartmental OA and indication for UKA were included. Overall 54 females and 62 males with an average age of 62.7 years (±9.8) and an average body mass index (BMI) of 29.2 (± 3.7) were recruited. Clinical results and PRO were assessed using the Knee Society Score (KSS). Follow-ups took place 3 months, 1 and 2 years after surgery including clinical examination, radiographs, assessment of PRO and adverse events. Pain and satisfaction were evaluated using a visual analog scale (VAS, 0 (worst) to 10 (best)).For comparison with TKA a propensity score matched-pair analysis was performed to eliminate confounders. Matching criteria were gender, patient´s age, BMI and comorbidities. A total of 116 matched-pairs were analysed. ResultsThere was no revision in the UKA group until 2 years after surgery. Revision rates were higher in the TKA group (0.6%).Preoperative KSS-Scores were higher within the UKA cohort (p < 0.001). After surgical treatment, PROMs displayed a significant improvement (p < 0,001) in both cohorts. Regarding the Knee-Score (Pain, Alignment, ROM) we observed no differences between cohorts after 12 months. The Function-Score demonstrated significantly better results in the UKA cohort (UKA vs. TKA 95 vs 80, p < 0.001). Patient satisfaction was higher in UKA patients (UKA vs TKA 9.0 vs 8.8, p = 0.019).ConclusionPatients of both cohorts showed high satisfaction after knee arthroplasty. UKA resulted in higher function scores compared to TKA without increased revision rate during short-term follow-up. Therefore, UKA is a good treatment option for unicompartmental OA. Trial registrationClinicaltrials.gov, NCT04598568. Registered 22 October 2020 - Retrospectively registered, https://www.clinicaltrials.gov/ct2/show/record/NCT04598568?cond=balanSys+Uni&draw=2&rank=1

Comparision of Fixed-Bearing and Mobile-Bearing Total Knee Arthroplasties: Short-Term Clinical Results

2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Burak Kaymaz ◽  
Cihan Sevinçhan ◽  
Umut Hatay Gölge ◽  
Gurdal Nusran ◽  
Ferdi Göksel ◽  
...  
Keyword(s):  
Mobile Bearing ◽  
Clinical Results ◽  
Total Knee Arthroplasties ◽  
Fixed Bearing ◽  
Short Term ◽  
Total Knee

scholarly journals Better short-term function after unicompartmental compared to total knee arthroplasty

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Eric Tille ◽  
Franziska Beyer ◽  
Kai Auerbach ◽  
Marco Tinius ◽  
Jörg Lützner
Keyword(s):  
Total Knee Arthroplasty ◽  
Treatment Option ◽  
Knee Arthroplasty ◽  
Clinical Results ◽  
Matched Pair ◽  
Short Term ◽  
Patient’S Satisfaction ◽  
Patient Reported ◽  
Total Knee ◽  
Matching Criteria

Abstract Background Unicompartmental knee arthroplasty (UKA) is an established treatment option for patients with unicompartmental osteoarthritis (OA). However, strict patient selection is crucial for its success. The proposed advantages include nearly natural knee kinematics, faster rehabilitation and better functional outcomes. Despite the aforementioned facts and it’s proven cost-effectiveness, there are still hesitations for the use of UKA as an alternative to total knee arthroplasty (TKA). Key objectives of this study were therefore to assess clinical and patient-reported outcome (PRO) as well as patient’s satisfaction after medial UKA in comparison to TKA. Methods To assess the outcome after UKA we conducted a prospective multi-center study. 116 patients with unicompartmental OA and indication for UKA were included. Overall 54 females and 62 males with an average age of 62.7 years (±9.8) and an average body mass index (BMI) of 29.2 (± 3.7) were recruited. Clinical results and PRO were assessed using the Knee Society Score (KSS). Follow-ups took place 3 months, 1 and 2 years after surgery including clinical examination, radiographs, assessment of PRO and adverse events. Pain and satisfaction was evaluated using a visual analog scale (VAS, 0 (worst) to 10 (best)). For comparison with TKA a propensity score matched-pair analysis was performed to eliminate confounders. Matching criteria were gender, patient’s age, BMI and comorbidities. A total of 116 matched-pairs were analysed. Results There was no revision in the UKA group until 2 years after surgery. Revision rates were higher in the TKA group (0.6%). Preoperative KSS-Scores were higher within the UKA cohort (p <  0.001). After surgical treatment, PROMs displayed a significant improvement (p <  0,001) in both cohorts. Regarding the Knee-Score (Pain, Alignment, ROM) we observed no differences between cohorts after 12 months. The Function-Score demonstrated significantly better results in the UKA cohort (UKA vs. TKA 95 vs 80, p <  0.001). Patient satisfaction was also higher in UKA patients (UKA vs TKA 9.0 vs 8.8, p = 0.019). Conclusion Patients of both cohorts showed high satisfaction after knee arthroplasty. UKA resulted in higher function scores compared to TKA without increased revision rate during short-term follow-up. Therefore, UKA is a good treatment option for unicompartmental OA. Trial registration Clinicaltrials.gov, NCT04598568. Registered 22 October 2020 - Retrospectively registered.

scholarly journals Outcomes of distal femoral arthroplasty after periprosthetic fractures: minimum 2-year follow-up

2021 ◽  
Vol 87 (1) ◽  
pp. 111-116
Author(s):  
Y Warschawski ◽  
S Garceau ◽  
M Bonyun ◽  
O Dahduli ◽  
J Wolfstadt ◽  
...  
Keyword(s):  
Operative Time ◽  
Knee Dislocation ◽  
Consecutive Series ◽  
Success Rates ◽  
Short Term ◽  
Average Operative Time ◽  
Total Knee ◽  
The Mean ◽  
Periprosthetic Infections

Purpose : distal femoral periprosthetic fracture (DFPPF) is a serious complication following total knee arthroplasty (TKA). Recently, treatment of DFPPF with distal femoral arthroplasty (DFA) has gained popularity because of its posited benefits for both patients and the medical system. Short-term follow-up trials investigating DFA have demonstrated acceptable results with regards to function, pain relief and lower postoperative complications than ORIF in elderly patients. The purpose of the current study was to evaluate a consecutive series of DFPPF treated with DFA, with a minimum 2- year follow-up. Methods : We performed a retrospective study asses- sing the outcomes of distal femoral arthroplasty (DFA) for patients diagnosed with DFPPF. Results : Twenty patients were identified. The mean age of patients was 76.3 (SD, 9.41), the average time from the fracture to revision surgery was 6.7 days (SD, 11.35), The average operative time was 93.5 minutes (SD,16.6). The average follow-up time was 50.15 months (SD, 20.87). During this time, two patients (10%) had complications. One patient experienced a knee dislocation and the second patient had recurrent periprosthetic infections. At final follow up, the mean knee society score was 86.25 (SD, 9.44), the mean Forgotten joint score was 62.16(SD, 23.45) and 93.7 percent of patients were ambulatory. Conclusion : DFA following DFPPF is associated with high success rates and provides patients with the opportunity for return of function in a safe and reliable manner.

scholarly journals Kinematically Aligned Total Knee Arthroplasty or Mechanically Aligned Total Knee Arthroplasty

2018 ◽  
Vol 31 (10) ◽  
pp. 999-1006 ◽  
Author(s):  
Juned Ansari ◽  
Hemant Pandit ◽  
Tsuneari Takahashi
Keyword(s):  
Systematic Review ◽  
Total Knee Arthroplasty ◽  
Clinical Outcomes ◽  
Knee Arthroplasty ◽  
Tibial Component ◽  
Meta Analysis ◽  
Clinical Results ◽  
Patient Specific ◽  
Total Knee

AbstractKinematically aligned total knee arthroplasty (KATKA) was developed to more anatomically align the knee prosthesis to restore the native alignment of the knee and promote physiological kinematics. Even though there are concerns with implant survival, and follow-up at 10 years or more after KATKA has not been reported, there is a negligible incidence of failure of a tibial component at 2 to 9 years. Early clinical results with this technique are encouraging and demonstrate better functional outcomes compared with mechanically aligned TKA (MATKA). The purpose of this study is to perform a systematic review and meta-analysis of the literature to determine whether there are any clinical differences between KATKA and MATKA. The authors conducted a systematic review of the English literature. Five randomized controlled trials (RCTs) which compared clinical outcomes of KATKA and MATKA were finally included. Four RCTs used patient-specific instrument, and one RCT used navigation. Data were extracted and meta-analysis was conducted. KATKA patients had better outcomes: Mean difference between KATKA and MATKA and p-value are presented in brackets after each variable: the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) (–12.5; p < 0.0001), Oxford Knee Score (OKS) (2.3; p = 0.030), combined Knee Society Score (C-KSS) (13.1; p < 0.0001), Knee Function Score (KFS) (6.4; p = 0.0070), and postoperative range of motion (ROM) (4.1°; p = 0.0010). There was no significant difference concerning the complication rates which needed reoperations or revision surgery (odds ratio, 1.01; p = 0.99). KATKA components had a more femoral valgus (–1.8°; p < 0.0001), more tibial varus (1.2°; p = 0.0001), and more tibial slope (1.2°; p = 0.0001), all being statistically significantly different. Better clinical outcomes were obtained in KATKA and component placement in KATKA is significantly different from that in MATKA. There was no increase of patients with poor clinical results due to implant position especially for varus placement of tibial component. This systematic review of five RCTs suggests that KATKA is of potential alternative method to MATKA since the risk of revision for tibial loosening is negligible compared with MATKA for the same follow-up period.

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